Best way to illuminate a non-backlit keyboard?

Specifically the Lenovo Z40 laptop

Not gonna happen unless you can somehow replace the entire keyboard. Or using something like a USB powered light

Yea if you open a backlit keyboard you'll see its designed to channel light through the whole keyboard. Not gonna be able to pull it off unless you get like a usb book light kind of thing and even then Its not going to back light it. You'll just be able to see it in the dark. I have this and its great and cheap.